Commit | Line | Data |
---|---|---|
602adf40 YS |
1 | /* |
2 | rbd.c -- Export ceph rados objects as a Linux block device | |
3 | ||
4 | ||
5 | based on drivers/block/osdblk.c: | |
6 | ||
7 | Copyright 2009 Red Hat, Inc. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; see the file COPYING. If not, write to | |
20 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | ||
dfc5606d | 24 | For usage instructions, please refer to: |
602adf40 | 25 | |
dfc5606d | 26 | Documentation/ABI/testing/sysfs-bus-rbd |
602adf40 YS |
27 | |
28 | */ | |
29 | ||
30 | #include <linux/ceph/libceph.h> | |
31 | #include <linux/ceph/osd_client.h> | |
32 | #include <linux/ceph/mon_client.h> | |
33 | #include <linux/ceph/decode.h> | |
59c2be1e | 34 | #include <linux/parser.h> |
602adf40 YS |
35 | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/fs.h> | |
40 | #include <linux/blkdev.h> | |
41 | ||
42 | #include "rbd_types.h" | |
43 | ||
44 | #define DRV_NAME "rbd" | |
45 | #define DRV_NAME_LONG "rbd (rados block device)" | |
46 | ||
47 | #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ | |
48 | ||
49 | #define RBD_MAX_MD_NAME_LEN (96 + sizeof(RBD_SUFFIX)) | |
50 | #define RBD_MAX_POOL_NAME_LEN 64 | |
51 | #define RBD_MAX_SNAP_NAME_LEN 32 | |
52 | #define RBD_MAX_OPT_LEN 1024 | |
53 | ||
54 | #define RBD_SNAP_HEAD_NAME "-" | |
55 | ||
56 | #define DEV_NAME_LEN 32 | |
57 | ||
59c2be1e YS |
58 | #define RBD_NOTIFY_TIMEOUT_DEFAULT 10 |
59 | ||
602adf40 YS |
60 | /* |
61 | * block device image metadata (in-memory version) | |
62 | */ | |
63 | struct rbd_image_header { | |
64 | u64 image_size; | |
65 | char block_name[32]; | |
66 | __u8 obj_order; | |
67 | __u8 crypt_type; | |
68 | __u8 comp_type; | |
69 | struct rw_semaphore snap_rwsem; | |
70 | struct ceph_snap_context *snapc; | |
71 | size_t snap_names_len; | |
72 | u64 snap_seq; | |
73 | u32 total_snaps; | |
74 | ||
75 | char *snap_names; | |
76 | u64 *snap_sizes; | |
59c2be1e YS |
77 | |
78 | u64 obj_version; | |
79 | }; | |
80 | ||
81 | struct rbd_options { | |
82 | int notify_timeout; | |
602adf40 YS |
83 | }; |
84 | ||
85 | /* | |
86 | * an instance of the client. multiple devices may share a client. | |
87 | */ | |
88 | struct rbd_client { | |
89 | struct ceph_client *client; | |
59c2be1e | 90 | struct rbd_options *rbd_opts; |
602adf40 YS |
91 | struct kref kref; |
92 | struct list_head node; | |
93 | }; | |
94 | ||
1fec7093 YS |
95 | struct rbd_req_coll; |
96 | ||
602adf40 YS |
97 | /* |
98 | * a single io request | |
99 | */ | |
100 | struct rbd_request { | |
101 | struct request *rq; /* blk layer request */ | |
102 | struct bio *bio; /* cloned bio */ | |
103 | struct page **pages; /* list of used pages */ | |
104 | u64 len; | |
1fec7093 YS |
105 | int coll_index; |
106 | struct rbd_req_coll *coll; | |
107 | }; | |
108 | ||
109 | struct rbd_req_status { | |
110 | int done; | |
111 | int rc; | |
112 | u64 bytes; | |
113 | }; | |
114 | ||
115 | /* | |
116 | * a collection of requests | |
117 | */ | |
118 | struct rbd_req_coll { | |
119 | int total; | |
120 | int num_done; | |
121 | struct kref kref; | |
122 | struct rbd_req_status status[0]; | |
602adf40 YS |
123 | }; |
124 | ||
dfc5606d YS |
125 | struct rbd_snap { |
126 | struct device dev; | |
127 | const char *name; | |
128 | size_t size; | |
129 | struct list_head node; | |
130 | u64 id; | |
131 | }; | |
132 | ||
602adf40 YS |
133 | /* |
134 | * a single device | |
135 | */ | |
136 | struct rbd_device { | |
137 | int id; /* blkdev unique id */ | |
138 | ||
139 | int major; /* blkdev assigned major */ | |
140 | struct gendisk *disk; /* blkdev's gendisk and rq */ | |
141 | struct request_queue *q; | |
142 | ||
143 | struct ceph_client *client; | |
144 | struct rbd_client *rbd_client; | |
145 | ||
146 | char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ | |
147 | ||
148 | spinlock_t lock; /* queue lock */ | |
149 | ||
150 | struct rbd_image_header header; | |
151 | char obj[RBD_MAX_OBJ_NAME_LEN]; /* rbd image name */ | |
152 | int obj_len; | |
153 | char obj_md_name[RBD_MAX_MD_NAME_LEN]; /* hdr nm. */ | |
154 | char pool_name[RBD_MAX_POOL_NAME_LEN]; | |
155 | int poolid; | |
156 | ||
59c2be1e YS |
157 | struct ceph_osd_event *watch_event; |
158 | struct ceph_osd_request *watch_request; | |
159 | ||
602adf40 YS |
160 | char snap_name[RBD_MAX_SNAP_NAME_LEN]; |
161 | u32 cur_snap; /* index+1 of current snapshot within snap context | |
162 | 0 - for the head */ | |
163 | int read_only; | |
164 | ||
165 | struct list_head node; | |
dfc5606d YS |
166 | |
167 | /* list of snapshots */ | |
168 | struct list_head snaps; | |
169 | ||
170 | /* sysfs related */ | |
171 | struct device dev; | |
172 | }; | |
173 | ||
174 | static struct bus_type rbd_bus_type = { | |
175 | .name = "rbd", | |
602adf40 YS |
176 | }; |
177 | ||
178 | static spinlock_t node_lock; /* protects client get/put */ | |
179 | ||
602adf40 YS |
180 | static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
181 | static LIST_HEAD(rbd_dev_list); /* devices */ | |
182 | static LIST_HEAD(rbd_client_list); /* clients */ | |
183 | ||
dfc5606d YS |
184 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev); |
185 | static void rbd_dev_release(struct device *dev); | |
dfc5606d YS |
186 | static ssize_t rbd_snap_add(struct device *dev, |
187 | struct device_attribute *attr, | |
188 | const char *buf, | |
189 | size_t count); | |
190 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
69932487 | 191 | struct rbd_snap *snap); |
dfc5606d YS |
192 | |
193 | ||
194 | static struct rbd_device *dev_to_rbd(struct device *dev) | |
195 | { | |
196 | return container_of(dev, struct rbd_device, dev); | |
197 | } | |
198 | ||
199 | static struct device *rbd_get_dev(struct rbd_device *rbd_dev) | |
200 | { | |
201 | return get_device(&rbd_dev->dev); | |
202 | } | |
203 | ||
204 | static void rbd_put_dev(struct rbd_device *rbd_dev) | |
205 | { | |
206 | put_device(&rbd_dev->dev); | |
207 | } | |
602adf40 | 208 | |
59c2be1e YS |
209 | static int __rbd_update_snaps(struct rbd_device *rbd_dev); |
210 | ||
602adf40 YS |
211 | static int rbd_open(struct block_device *bdev, fmode_t mode) |
212 | { | |
213 | struct gendisk *disk = bdev->bd_disk; | |
214 | struct rbd_device *rbd_dev = disk->private_data; | |
215 | ||
dfc5606d YS |
216 | rbd_get_dev(rbd_dev); |
217 | ||
602adf40 YS |
218 | set_device_ro(bdev, rbd_dev->read_only); |
219 | ||
220 | if ((mode & FMODE_WRITE) && rbd_dev->read_only) | |
221 | return -EROFS; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
dfc5606d YS |
226 | static int rbd_release(struct gendisk *disk, fmode_t mode) |
227 | { | |
228 | struct rbd_device *rbd_dev = disk->private_data; | |
229 | ||
230 | rbd_put_dev(rbd_dev); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
602adf40 YS |
235 | static const struct block_device_operations rbd_bd_ops = { |
236 | .owner = THIS_MODULE, | |
237 | .open = rbd_open, | |
dfc5606d | 238 | .release = rbd_release, |
602adf40 YS |
239 | }; |
240 | ||
241 | /* | |
242 | * Initialize an rbd client instance. | |
243 | * We own *opt. | |
244 | */ | |
59c2be1e YS |
245 | static struct rbd_client *rbd_client_create(struct ceph_options *opt, |
246 | struct rbd_options *rbd_opts) | |
602adf40 YS |
247 | { |
248 | struct rbd_client *rbdc; | |
249 | int ret = -ENOMEM; | |
250 | ||
251 | dout("rbd_client_create\n"); | |
252 | rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); | |
253 | if (!rbdc) | |
254 | goto out_opt; | |
255 | ||
256 | kref_init(&rbdc->kref); | |
257 | INIT_LIST_HEAD(&rbdc->node); | |
258 | ||
6ab00d46 | 259 | rbdc->client = ceph_create_client(opt, rbdc, 0, 0); |
602adf40 YS |
260 | if (IS_ERR(rbdc->client)) |
261 | goto out_rbdc; | |
28f259b7 | 262 | opt = NULL; /* Now rbdc->client is responsible for opt */ |
602adf40 YS |
263 | |
264 | ret = ceph_open_session(rbdc->client); | |
265 | if (ret < 0) | |
266 | goto out_err; | |
267 | ||
59c2be1e YS |
268 | rbdc->rbd_opts = rbd_opts; |
269 | ||
602adf40 YS |
270 | spin_lock(&node_lock); |
271 | list_add_tail(&rbdc->node, &rbd_client_list); | |
272 | spin_unlock(&node_lock); | |
273 | ||
274 | dout("rbd_client_create created %p\n", rbdc); | |
275 | return rbdc; | |
276 | ||
277 | out_err: | |
278 | ceph_destroy_client(rbdc->client); | |
602adf40 YS |
279 | out_rbdc: |
280 | kfree(rbdc); | |
281 | out_opt: | |
28f259b7 VK |
282 | if (opt) |
283 | ceph_destroy_options(opt); | |
284 | return ERR_PTR(ret); | |
602adf40 YS |
285 | } |
286 | ||
287 | /* | |
288 | * Find a ceph client with specific addr and configuration. | |
289 | */ | |
290 | static struct rbd_client *__rbd_client_find(struct ceph_options *opt) | |
291 | { | |
292 | struct rbd_client *client_node; | |
293 | ||
294 | if (opt->flags & CEPH_OPT_NOSHARE) | |
295 | return NULL; | |
296 | ||
297 | list_for_each_entry(client_node, &rbd_client_list, node) | |
298 | if (ceph_compare_options(opt, client_node->client) == 0) | |
299 | return client_node; | |
300 | return NULL; | |
301 | } | |
302 | ||
59c2be1e YS |
303 | /* |
304 | * mount options | |
305 | */ | |
306 | enum { | |
307 | Opt_notify_timeout, | |
308 | Opt_last_int, | |
309 | /* int args above */ | |
310 | Opt_last_string, | |
311 | /* string args above */ | |
312 | }; | |
313 | ||
314 | static match_table_t rbdopt_tokens = { | |
315 | {Opt_notify_timeout, "notify_timeout=%d"}, | |
316 | /* int args above */ | |
317 | /* string args above */ | |
318 | {-1, NULL} | |
319 | }; | |
320 | ||
321 | static int parse_rbd_opts_token(char *c, void *private) | |
322 | { | |
323 | struct rbd_options *rbdopt = private; | |
324 | substring_t argstr[MAX_OPT_ARGS]; | |
325 | int token, intval, ret; | |
326 | ||
327 | token = match_token((char *)c, rbdopt_tokens, argstr); | |
328 | if (token < 0) | |
329 | return -EINVAL; | |
330 | ||
331 | if (token < Opt_last_int) { | |
332 | ret = match_int(&argstr[0], &intval); | |
333 | if (ret < 0) { | |
334 | pr_err("bad mount option arg (not int) " | |
335 | "at '%s'\n", c); | |
336 | return ret; | |
337 | } | |
338 | dout("got int token %d val %d\n", token, intval); | |
339 | } else if (token > Opt_last_int && token < Opt_last_string) { | |
340 | dout("got string token %d val %s\n", token, | |
341 | argstr[0].from); | |
342 | } else { | |
343 | dout("got token %d\n", token); | |
344 | } | |
345 | ||
346 | switch (token) { | |
347 | case Opt_notify_timeout: | |
348 | rbdopt->notify_timeout = intval; | |
349 | break; | |
350 | default: | |
351 | BUG_ON(token); | |
352 | } | |
353 | return 0; | |
354 | } | |
355 | ||
602adf40 YS |
356 | /* |
357 | * Get a ceph client with specific addr and configuration, if one does | |
358 | * not exist create it. | |
359 | */ | |
360 | static int rbd_get_client(struct rbd_device *rbd_dev, const char *mon_addr, | |
361 | char *options) | |
362 | { | |
363 | struct rbd_client *rbdc; | |
364 | struct ceph_options *opt; | |
365 | int ret; | |
59c2be1e YS |
366 | struct rbd_options *rbd_opts; |
367 | ||
368 | rbd_opts = kzalloc(sizeof(*rbd_opts), GFP_KERNEL); | |
369 | if (!rbd_opts) | |
370 | return -ENOMEM; | |
371 | ||
372 | rbd_opts->notify_timeout = RBD_NOTIFY_TIMEOUT_DEFAULT; | |
602adf40 YS |
373 | |
374 | ret = ceph_parse_options(&opt, options, mon_addr, | |
59c2be1e | 375 | mon_addr + strlen(mon_addr), parse_rbd_opts_token, rbd_opts); |
602adf40 | 376 | if (ret < 0) |
59c2be1e | 377 | goto done_err; |
602adf40 YS |
378 | |
379 | spin_lock(&node_lock); | |
380 | rbdc = __rbd_client_find(opt); | |
381 | if (rbdc) { | |
382 | ceph_destroy_options(opt); | |
97bb59a0 | 383 | kfree(rbd_opts); |
602adf40 YS |
384 | |
385 | /* using an existing client */ | |
386 | kref_get(&rbdc->kref); | |
387 | rbd_dev->rbd_client = rbdc; | |
388 | rbd_dev->client = rbdc->client; | |
389 | spin_unlock(&node_lock); | |
390 | return 0; | |
391 | } | |
392 | spin_unlock(&node_lock); | |
393 | ||
59c2be1e YS |
394 | rbdc = rbd_client_create(opt, rbd_opts); |
395 | if (IS_ERR(rbdc)) { | |
396 | ret = PTR_ERR(rbdc); | |
397 | goto done_err; | |
398 | } | |
602adf40 YS |
399 | |
400 | rbd_dev->rbd_client = rbdc; | |
401 | rbd_dev->client = rbdc->client; | |
402 | return 0; | |
59c2be1e YS |
403 | done_err: |
404 | kfree(rbd_opts); | |
405 | return ret; | |
602adf40 YS |
406 | } |
407 | ||
408 | /* | |
409 | * Destroy ceph client | |
d23a4b3f AE |
410 | * |
411 | * Caller must hold node_lock. | |
602adf40 YS |
412 | */ |
413 | static void rbd_client_release(struct kref *kref) | |
414 | { | |
415 | struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); | |
416 | ||
417 | dout("rbd_release_client %p\n", rbdc); | |
602adf40 | 418 | list_del(&rbdc->node); |
602adf40 YS |
419 | |
420 | ceph_destroy_client(rbdc->client); | |
59c2be1e | 421 | kfree(rbdc->rbd_opts); |
602adf40 YS |
422 | kfree(rbdc); |
423 | } | |
424 | ||
425 | /* | |
426 | * Drop reference to ceph client node. If it's not referenced anymore, release | |
427 | * it. | |
428 | */ | |
429 | static void rbd_put_client(struct rbd_device *rbd_dev) | |
430 | { | |
d23a4b3f | 431 | spin_lock(&node_lock); |
602adf40 | 432 | kref_put(&rbd_dev->rbd_client->kref, rbd_client_release); |
d23a4b3f | 433 | spin_unlock(&node_lock); |
602adf40 YS |
434 | rbd_dev->rbd_client = NULL; |
435 | rbd_dev->client = NULL; | |
436 | } | |
437 | ||
1fec7093 YS |
438 | /* |
439 | * Destroy requests collection | |
440 | */ | |
441 | static void rbd_coll_release(struct kref *kref) | |
442 | { | |
443 | struct rbd_req_coll *coll = | |
444 | container_of(kref, struct rbd_req_coll, kref); | |
445 | ||
446 | dout("rbd_coll_release %p\n", coll); | |
447 | kfree(coll); | |
448 | } | |
602adf40 YS |
449 | |
450 | /* | |
451 | * Create a new header structure, translate header format from the on-disk | |
452 | * header. | |
453 | */ | |
454 | static int rbd_header_from_disk(struct rbd_image_header *header, | |
455 | struct rbd_image_header_ondisk *ondisk, | |
456 | int allocated_snaps, | |
457 | gfp_t gfp_flags) | |
458 | { | |
459 | int i; | |
460 | u32 snap_count = le32_to_cpu(ondisk->snap_count); | |
461 | int ret = -ENOMEM; | |
462 | ||
81e759fb JD |
463 | if (memcmp(ondisk, RBD_HEADER_TEXT, sizeof(RBD_HEADER_TEXT))) { |
464 | return -ENXIO; | |
465 | } | |
466 | ||
602adf40 | 467 | init_rwsem(&header->snap_rwsem); |
602adf40 YS |
468 | header->snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
469 | header->snapc = kmalloc(sizeof(struct ceph_snap_context) + | |
470 | snap_count * | |
471 | sizeof(struct rbd_image_snap_ondisk), | |
472 | gfp_flags); | |
473 | if (!header->snapc) | |
474 | return -ENOMEM; | |
475 | if (snap_count) { | |
476 | header->snap_names = kmalloc(header->snap_names_len, | |
477 | GFP_KERNEL); | |
478 | if (!header->snap_names) | |
479 | goto err_snapc; | |
480 | header->snap_sizes = kmalloc(snap_count * sizeof(u64), | |
481 | GFP_KERNEL); | |
482 | if (!header->snap_sizes) | |
483 | goto err_names; | |
484 | } else { | |
485 | header->snap_names = NULL; | |
486 | header->snap_sizes = NULL; | |
487 | } | |
488 | memcpy(header->block_name, ondisk->block_name, | |
489 | sizeof(ondisk->block_name)); | |
490 | ||
491 | header->image_size = le64_to_cpu(ondisk->image_size); | |
492 | header->obj_order = ondisk->options.order; | |
493 | header->crypt_type = ondisk->options.crypt_type; | |
494 | header->comp_type = ondisk->options.comp_type; | |
495 | ||
496 | atomic_set(&header->snapc->nref, 1); | |
497 | header->snap_seq = le64_to_cpu(ondisk->snap_seq); | |
498 | header->snapc->num_snaps = snap_count; | |
499 | header->total_snaps = snap_count; | |
500 | ||
501 | if (snap_count && | |
502 | allocated_snaps == snap_count) { | |
503 | for (i = 0; i < snap_count; i++) { | |
504 | header->snapc->snaps[i] = | |
505 | le64_to_cpu(ondisk->snaps[i].id); | |
506 | header->snap_sizes[i] = | |
507 | le64_to_cpu(ondisk->snaps[i].image_size); | |
508 | } | |
509 | ||
510 | /* copy snapshot names */ | |
511 | memcpy(header->snap_names, &ondisk->snaps[i], | |
512 | header->snap_names_len); | |
513 | } | |
514 | ||
515 | return 0; | |
516 | ||
517 | err_names: | |
518 | kfree(header->snap_names); | |
519 | err_snapc: | |
520 | kfree(header->snapc); | |
521 | return ret; | |
522 | } | |
523 | ||
524 | static int snap_index(struct rbd_image_header *header, int snap_num) | |
525 | { | |
526 | return header->total_snaps - snap_num; | |
527 | } | |
528 | ||
529 | static u64 cur_snap_id(struct rbd_device *rbd_dev) | |
530 | { | |
531 | struct rbd_image_header *header = &rbd_dev->header; | |
532 | ||
533 | if (!rbd_dev->cur_snap) | |
534 | return 0; | |
535 | ||
536 | return header->snapc->snaps[snap_index(header, rbd_dev->cur_snap)]; | |
537 | } | |
538 | ||
539 | static int snap_by_name(struct rbd_image_header *header, const char *snap_name, | |
540 | u64 *seq, u64 *size) | |
541 | { | |
542 | int i; | |
543 | char *p = header->snap_names; | |
544 | ||
545 | for (i = 0; i < header->total_snaps; i++, p += strlen(p) + 1) { | |
546 | if (strcmp(snap_name, p) == 0) | |
547 | break; | |
548 | } | |
549 | if (i == header->total_snaps) | |
550 | return -ENOENT; | |
551 | if (seq) | |
552 | *seq = header->snapc->snaps[i]; | |
553 | ||
554 | if (size) | |
555 | *size = header->snap_sizes[i]; | |
556 | ||
557 | return i; | |
558 | } | |
559 | ||
560 | static int rbd_header_set_snap(struct rbd_device *dev, | |
561 | const char *snap_name, | |
562 | u64 *size) | |
563 | { | |
564 | struct rbd_image_header *header = &dev->header; | |
565 | struct ceph_snap_context *snapc = header->snapc; | |
566 | int ret = -ENOENT; | |
567 | ||
568 | down_write(&header->snap_rwsem); | |
569 | ||
570 | if (!snap_name || | |
571 | !*snap_name || | |
572 | strcmp(snap_name, "-") == 0 || | |
573 | strcmp(snap_name, RBD_SNAP_HEAD_NAME) == 0) { | |
574 | if (header->total_snaps) | |
575 | snapc->seq = header->snap_seq; | |
576 | else | |
577 | snapc->seq = 0; | |
578 | dev->cur_snap = 0; | |
579 | dev->read_only = 0; | |
580 | if (size) | |
581 | *size = header->image_size; | |
582 | } else { | |
583 | ret = snap_by_name(header, snap_name, &snapc->seq, size); | |
584 | if (ret < 0) | |
585 | goto done; | |
586 | ||
587 | dev->cur_snap = header->total_snaps - ret; | |
588 | dev->read_only = 1; | |
589 | } | |
590 | ||
591 | ret = 0; | |
592 | done: | |
593 | up_write(&header->snap_rwsem); | |
594 | return ret; | |
595 | } | |
596 | ||
597 | static void rbd_header_free(struct rbd_image_header *header) | |
598 | { | |
599 | kfree(header->snapc); | |
600 | kfree(header->snap_names); | |
601 | kfree(header->snap_sizes); | |
602 | } | |
603 | ||
604 | /* | |
605 | * get the actual striped segment name, offset and length | |
606 | */ | |
607 | static u64 rbd_get_segment(struct rbd_image_header *header, | |
608 | const char *block_name, | |
609 | u64 ofs, u64 len, | |
610 | char *seg_name, u64 *segofs) | |
611 | { | |
612 | u64 seg = ofs >> header->obj_order; | |
613 | ||
614 | if (seg_name) | |
615 | snprintf(seg_name, RBD_MAX_SEG_NAME_LEN, | |
616 | "%s.%012llx", block_name, seg); | |
617 | ||
618 | ofs = ofs & ((1 << header->obj_order) - 1); | |
619 | len = min_t(u64, len, (1 << header->obj_order) - ofs); | |
620 | ||
621 | if (segofs) | |
622 | *segofs = ofs; | |
623 | ||
624 | return len; | |
625 | } | |
626 | ||
1fec7093 YS |
627 | static int rbd_get_num_segments(struct rbd_image_header *header, |
628 | u64 ofs, u64 len) | |
629 | { | |
630 | u64 start_seg = ofs >> header->obj_order; | |
631 | u64 end_seg = (ofs + len - 1) >> header->obj_order; | |
632 | return end_seg - start_seg + 1; | |
633 | } | |
634 | ||
029bcbd8 JD |
635 | /* |
636 | * returns the size of an object in the image | |
637 | */ | |
638 | static u64 rbd_obj_bytes(struct rbd_image_header *header) | |
639 | { | |
640 | return 1 << header->obj_order; | |
641 | } | |
642 | ||
602adf40 YS |
643 | /* |
644 | * bio helpers | |
645 | */ | |
646 | ||
647 | static void bio_chain_put(struct bio *chain) | |
648 | { | |
649 | struct bio *tmp; | |
650 | ||
651 | while (chain) { | |
652 | tmp = chain; | |
653 | chain = chain->bi_next; | |
654 | bio_put(tmp); | |
655 | } | |
656 | } | |
657 | ||
658 | /* | |
659 | * zeros a bio chain, starting at specific offset | |
660 | */ | |
661 | static void zero_bio_chain(struct bio *chain, int start_ofs) | |
662 | { | |
663 | struct bio_vec *bv; | |
664 | unsigned long flags; | |
665 | void *buf; | |
666 | int i; | |
667 | int pos = 0; | |
668 | ||
669 | while (chain) { | |
670 | bio_for_each_segment(bv, chain, i) { | |
671 | if (pos + bv->bv_len > start_ofs) { | |
672 | int remainder = max(start_ofs - pos, 0); | |
673 | buf = bvec_kmap_irq(bv, &flags); | |
674 | memset(buf + remainder, 0, | |
675 | bv->bv_len - remainder); | |
85b5aaa6 | 676 | bvec_kunmap_irq(buf, &flags); |
602adf40 YS |
677 | } |
678 | pos += bv->bv_len; | |
679 | } | |
680 | ||
681 | chain = chain->bi_next; | |
682 | } | |
683 | } | |
684 | ||
685 | /* | |
686 | * bio_chain_clone - clone a chain of bios up to a certain length. | |
687 | * might return a bio_pair that will need to be released. | |
688 | */ | |
689 | static struct bio *bio_chain_clone(struct bio **old, struct bio **next, | |
690 | struct bio_pair **bp, | |
691 | int len, gfp_t gfpmask) | |
692 | { | |
693 | struct bio *tmp, *old_chain = *old, *new_chain = NULL, *tail = NULL; | |
694 | int total = 0; | |
695 | ||
696 | if (*bp) { | |
697 | bio_pair_release(*bp); | |
698 | *bp = NULL; | |
699 | } | |
700 | ||
701 | while (old_chain && (total < len)) { | |
702 | tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs); | |
703 | if (!tmp) | |
704 | goto err_out; | |
705 | ||
706 | if (total + old_chain->bi_size > len) { | |
707 | struct bio_pair *bp; | |
708 | ||
709 | /* | |
710 | * this split can only happen with a single paged bio, | |
711 | * split_bio will BUG_ON if this is not the case | |
712 | */ | |
713 | dout("bio_chain_clone split! total=%d remaining=%d" | |
714 | "bi_size=%d\n", | |
715 | (int)total, (int)len-total, | |
716 | (int)old_chain->bi_size); | |
717 | ||
718 | /* split the bio. We'll release it either in the next | |
719 | call, or it will have to be released outside */ | |
720 | bp = bio_split(old_chain, (len - total) / 512ULL); | |
721 | if (!bp) | |
722 | goto err_out; | |
723 | ||
724 | __bio_clone(tmp, &bp->bio1); | |
725 | ||
726 | *next = &bp->bio2; | |
727 | } else { | |
728 | __bio_clone(tmp, old_chain); | |
729 | *next = old_chain->bi_next; | |
730 | } | |
731 | ||
732 | tmp->bi_bdev = NULL; | |
733 | gfpmask &= ~__GFP_WAIT; | |
734 | tmp->bi_next = NULL; | |
735 | ||
736 | if (!new_chain) { | |
737 | new_chain = tail = tmp; | |
738 | } else { | |
739 | tail->bi_next = tmp; | |
740 | tail = tmp; | |
741 | } | |
742 | old_chain = old_chain->bi_next; | |
743 | ||
744 | total += tmp->bi_size; | |
745 | } | |
746 | ||
747 | BUG_ON(total < len); | |
748 | ||
749 | if (tail) | |
750 | tail->bi_next = NULL; | |
751 | ||
752 | *old = old_chain; | |
753 | ||
754 | return new_chain; | |
755 | ||
756 | err_out: | |
757 | dout("bio_chain_clone with err\n"); | |
758 | bio_chain_put(new_chain); | |
759 | return NULL; | |
760 | } | |
761 | ||
762 | /* | |
763 | * helpers for osd request op vectors. | |
764 | */ | |
765 | static int rbd_create_rw_ops(struct ceph_osd_req_op **ops, | |
766 | int num_ops, | |
767 | int opcode, | |
768 | u32 payload_len) | |
769 | { | |
770 | *ops = kzalloc(sizeof(struct ceph_osd_req_op) * (num_ops + 1), | |
771 | GFP_NOIO); | |
772 | if (!*ops) | |
773 | return -ENOMEM; | |
774 | (*ops)[0].op = opcode; | |
775 | /* | |
776 | * op extent offset and length will be set later on | |
777 | * in calc_raw_layout() | |
778 | */ | |
779 | (*ops)[0].payload_len = payload_len; | |
780 | return 0; | |
781 | } | |
782 | ||
783 | static void rbd_destroy_ops(struct ceph_osd_req_op *ops) | |
784 | { | |
785 | kfree(ops); | |
786 | } | |
787 | ||
1fec7093 YS |
788 | static void rbd_coll_end_req_index(struct request *rq, |
789 | struct rbd_req_coll *coll, | |
790 | int index, | |
791 | int ret, u64 len) | |
792 | { | |
793 | struct request_queue *q; | |
794 | int min, max, i; | |
795 | ||
796 | dout("rbd_coll_end_req_index %p index %d ret %d len %lld\n", | |
797 | coll, index, ret, len); | |
798 | ||
799 | if (!rq) | |
800 | return; | |
801 | ||
802 | if (!coll) { | |
803 | blk_end_request(rq, ret, len); | |
804 | return; | |
805 | } | |
806 | ||
807 | q = rq->q; | |
808 | ||
809 | spin_lock_irq(q->queue_lock); | |
810 | coll->status[index].done = 1; | |
811 | coll->status[index].rc = ret; | |
812 | coll->status[index].bytes = len; | |
813 | max = min = coll->num_done; | |
814 | while (max < coll->total && coll->status[max].done) | |
815 | max++; | |
816 | ||
817 | for (i = min; i<max; i++) { | |
818 | __blk_end_request(rq, coll->status[i].rc, | |
819 | coll->status[i].bytes); | |
820 | coll->num_done++; | |
821 | kref_put(&coll->kref, rbd_coll_release); | |
822 | } | |
823 | spin_unlock_irq(q->queue_lock); | |
824 | } | |
825 | ||
826 | static void rbd_coll_end_req(struct rbd_request *req, | |
827 | int ret, u64 len) | |
828 | { | |
829 | rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len); | |
830 | } | |
831 | ||
602adf40 YS |
832 | /* |
833 | * Send ceph osd request | |
834 | */ | |
835 | static int rbd_do_request(struct request *rq, | |
836 | struct rbd_device *dev, | |
837 | struct ceph_snap_context *snapc, | |
838 | u64 snapid, | |
839 | const char *obj, u64 ofs, u64 len, | |
840 | struct bio *bio, | |
841 | struct page **pages, | |
842 | int num_pages, | |
843 | int flags, | |
844 | struct ceph_osd_req_op *ops, | |
845 | int num_reply, | |
1fec7093 YS |
846 | struct rbd_req_coll *coll, |
847 | int coll_index, | |
602adf40 | 848 | void (*rbd_cb)(struct ceph_osd_request *req, |
59c2be1e YS |
849 | struct ceph_msg *msg), |
850 | struct ceph_osd_request **linger_req, | |
851 | u64 *ver) | |
602adf40 YS |
852 | { |
853 | struct ceph_osd_request *req; | |
854 | struct ceph_file_layout *layout; | |
855 | int ret; | |
856 | u64 bno; | |
857 | struct timespec mtime = CURRENT_TIME; | |
858 | struct rbd_request *req_data; | |
859 | struct ceph_osd_request_head *reqhead; | |
860 | struct rbd_image_header *header = &dev->header; | |
861 | ||
602adf40 | 862 | req_data = kzalloc(sizeof(*req_data), GFP_NOIO); |
1fec7093 YS |
863 | if (!req_data) { |
864 | if (coll) | |
865 | rbd_coll_end_req_index(rq, coll, coll_index, | |
866 | -ENOMEM, len); | |
867 | return -ENOMEM; | |
868 | } | |
869 | ||
870 | if (coll) { | |
871 | req_data->coll = coll; | |
872 | req_data->coll_index = coll_index; | |
873 | } | |
602adf40 | 874 | |
1fec7093 | 875 | dout("rbd_do_request obj=%s ofs=%lld len=%lld\n", obj, len, ofs); |
602adf40 YS |
876 | |
877 | down_read(&header->snap_rwsem); | |
878 | ||
879 | req = ceph_osdc_alloc_request(&dev->client->osdc, flags, | |
880 | snapc, | |
881 | ops, | |
882 | false, | |
883 | GFP_NOIO, pages, bio); | |
4ad12621 | 884 | if (!req) { |
602adf40 | 885 | up_read(&header->snap_rwsem); |
4ad12621 | 886 | ret = -ENOMEM; |
602adf40 YS |
887 | goto done_pages; |
888 | } | |
889 | ||
890 | req->r_callback = rbd_cb; | |
891 | ||
892 | req_data->rq = rq; | |
893 | req_data->bio = bio; | |
894 | req_data->pages = pages; | |
895 | req_data->len = len; | |
896 | ||
897 | req->r_priv = req_data; | |
898 | ||
899 | reqhead = req->r_request->front.iov_base; | |
900 | reqhead->snapid = cpu_to_le64(CEPH_NOSNAP); | |
901 | ||
902 | strncpy(req->r_oid, obj, sizeof(req->r_oid)); | |
903 | req->r_oid_len = strlen(req->r_oid); | |
904 | ||
905 | layout = &req->r_file_layout; | |
906 | memset(layout, 0, sizeof(*layout)); | |
907 | layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
908 | layout->fl_stripe_count = cpu_to_le32(1); | |
909 | layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); | |
910 | layout->fl_pg_preferred = cpu_to_le32(-1); | |
911 | layout->fl_pg_pool = cpu_to_le32(dev->poolid); | |
912 | ceph_calc_raw_layout(&dev->client->osdc, layout, snapid, | |
913 | ofs, &len, &bno, req, ops); | |
914 | ||
915 | ceph_osdc_build_request(req, ofs, &len, | |
916 | ops, | |
917 | snapc, | |
918 | &mtime, | |
919 | req->r_oid, req->r_oid_len); | |
920 | up_read(&header->snap_rwsem); | |
921 | ||
59c2be1e YS |
922 | if (linger_req) { |
923 | ceph_osdc_set_request_linger(&dev->client->osdc, req); | |
924 | *linger_req = req; | |
925 | } | |
926 | ||
602adf40 YS |
927 | ret = ceph_osdc_start_request(&dev->client->osdc, req, false); |
928 | if (ret < 0) | |
929 | goto done_err; | |
930 | ||
931 | if (!rbd_cb) { | |
932 | ret = ceph_osdc_wait_request(&dev->client->osdc, req); | |
59c2be1e YS |
933 | if (ver) |
934 | *ver = le64_to_cpu(req->r_reassert_version.version); | |
1fec7093 YS |
935 | dout("reassert_ver=%lld\n", |
936 | le64_to_cpu(req->r_reassert_version.version)); | |
602adf40 YS |
937 | ceph_osdc_put_request(req); |
938 | } | |
939 | return ret; | |
940 | ||
941 | done_err: | |
942 | bio_chain_put(req_data->bio); | |
943 | ceph_osdc_put_request(req); | |
944 | done_pages: | |
1fec7093 | 945 | rbd_coll_end_req(req_data, ret, len); |
602adf40 | 946 | kfree(req_data); |
602adf40 YS |
947 | return ret; |
948 | } | |
949 | ||
950 | /* | |
951 | * Ceph osd op callback | |
952 | */ | |
953 | static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) | |
954 | { | |
955 | struct rbd_request *req_data = req->r_priv; | |
956 | struct ceph_osd_reply_head *replyhead; | |
957 | struct ceph_osd_op *op; | |
958 | __s32 rc; | |
959 | u64 bytes; | |
960 | int read_op; | |
961 | ||
962 | /* parse reply */ | |
963 | replyhead = msg->front.iov_base; | |
964 | WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); | |
965 | op = (void *)(replyhead + 1); | |
966 | rc = le32_to_cpu(replyhead->result); | |
967 | bytes = le64_to_cpu(op->extent.length); | |
968 | read_op = (le32_to_cpu(op->op) == CEPH_OSD_OP_READ); | |
969 | ||
970 | dout("rbd_req_cb bytes=%lld readop=%d rc=%d\n", bytes, read_op, rc); | |
971 | ||
972 | if (rc == -ENOENT && read_op) { | |
973 | zero_bio_chain(req_data->bio, 0); | |
974 | rc = 0; | |
975 | } else if (rc == 0 && read_op && bytes < req_data->len) { | |
976 | zero_bio_chain(req_data->bio, bytes); | |
977 | bytes = req_data->len; | |
978 | } | |
979 | ||
1fec7093 | 980 | rbd_coll_end_req(req_data, rc, bytes); |
602adf40 YS |
981 | |
982 | if (req_data->bio) | |
983 | bio_chain_put(req_data->bio); | |
984 | ||
985 | ceph_osdc_put_request(req); | |
986 | kfree(req_data); | |
987 | } | |
988 | ||
59c2be1e YS |
989 | static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg) |
990 | { | |
991 | ceph_osdc_put_request(req); | |
992 | } | |
993 | ||
602adf40 YS |
994 | /* |
995 | * Do a synchronous ceph osd operation | |
996 | */ | |
997 | static int rbd_req_sync_op(struct rbd_device *dev, | |
998 | struct ceph_snap_context *snapc, | |
999 | u64 snapid, | |
1000 | int opcode, | |
1001 | int flags, | |
1002 | struct ceph_osd_req_op *orig_ops, | |
1003 | int num_reply, | |
1004 | const char *obj, | |
1005 | u64 ofs, u64 len, | |
59c2be1e YS |
1006 | char *buf, |
1007 | struct ceph_osd_request **linger_req, | |
1008 | u64 *ver) | |
602adf40 YS |
1009 | { |
1010 | int ret; | |
1011 | struct page **pages; | |
1012 | int num_pages; | |
1013 | struct ceph_osd_req_op *ops = orig_ops; | |
1014 | u32 payload_len; | |
1015 | ||
1016 | num_pages = calc_pages_for(ofs , len); | |
1017 | pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); | |
b8d0638a DC |
1018 | if (IS_ERR(pages)) |
1019 | return PTR_ERR(pages); | |
602adf40 YS |
1020 | |
1021 | if (!orig_ops) { | |
1022 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? len : 0); | |
1023 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1024 | if (ret < 0) | |
1025 | goto done; | |
1026 | ||
1027 | if ((flags & CEPH_OSD_FLAG_WRITE) && buf) { | |
1028 | ret = ceph_copy_to_page_vector(pages, buf, ofs, len); | |
1029 | if (ret < 0) | |
1030 | goto done_ops; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | ret = rbd_do_request(NULL, dev, snapc, snapid, | |
1035 | obj, ofs, len, NULL, | |
1036 | pages, num_pages, | |
1037 | flags, | |
1038 | ops, | |
1039 | 2, | |
1fec7093 | 1040 | NULL, 0, |
59c2be1e YS |
1041 | NULL, |
1042 | linger_req, ver); | |
602adf40 YS |
1043 | if (ret < 0) |
1044 | goto done_ops; | |
1045 | ||
1046 | if ((flags & CEPH_OSD_FLAG_READ) && buf) | |
1047 | ret = ceph_copy_from_page_vector(pages, buf, ofs, ret); | |
1048 | ||
1049 | done_ops: | |
1050 | if (!orig_ops) | |
1051 | rbd_destroy_ops(ops); | |
1052 | done: | |
1053 | ceph_release_page_vector(pages, num_pages); | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Do an asynchronous ceph osd operation | |
1059 | */ | |
1060 | static int rbd_do_op(struct request *rq, | |
1061 | struct rbd_device *rbd_dev , | |
1062 | struct ceph_snap_context *snapc, | |
1063 | u64 snapid, | |
1064 | int opcode, int flags, int num_reply, | |
1065 | u64 ofs, u64 len, | |
1fec7093 YS |
1066 | struct bio *bio, |
1067 | struct rbd_req_coll *coll, | |
1068 | int coll_index) | |
602adf40 YS |
1069 | { |
1070 | char *seg_name; | |
1071 | u64 seg_ofs; | |
1072 | u64 seg_len; | |
1073 | int ret; | |
1074 | struct ceph_osd_req_op *ops; | |
1075 | u32 payload_len; | |
1076 | ||
1077 | seg_name = kmalloc(RBD_MAX_SEG_NAME_LEN + 1, GFP_NOIO); | |
1078 | if (!seg_name) | |
1079 | return -ENOMEM; | |
1080 | ||
1081 | seg_len = rbd_get_segment(&rbd_dev->header, | |
1082 | rbd_dev->header.block_name, | |
1083 | ofs, len, | |
1084 | seg_name, &seg_ofs); | |
602adf40 YS |
1085 | |
1086 | payload_len = (flags & CEPH_OSD_FLAG_WRITE ? seg_len : 0); | |
1087 | ||
1088 | ret = rbd_create_rw_ops(&ops, 1, opcode, payload_len); | |
1089 | if (ret < 0) | |
1090 | goto done; | |
1091 | ||
1092 | /* we've taken care of segment sizes earlier when we | |
1093 | cloned the bios. We should never have a segment | |
1094 | truncated at this point */ | |
1095 | BUG_ON(seg_len < len); | |
1096 | ||
1097 | ret = rbd_do_request(rq, rbd_dev, snapc, snapid, | |
1098 | seg_name, seg_ofs, seg_len, | |
1099 | bio, | |
1100 | NULL, 0, | |
1101 | flags, | |
1102 | ops, | |
1103 | num_reply, | |
1fec7093 | 1104 | coll, coll_index, |
59c2be1e | 1105 | rbd_req_cb, 0, NULL); |
11f77002 SW |
1106 | |
1107 | rbd_destroy_ops(ops); | |
602adf40 YS |
1108 | done: |
1109 | kfree(seg_name); | |
1110 | return ret; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Request async osd write | |
1115 | */ | |
1116 | static int rbd_req_write(struct request *rq, | |
1117 | struct rbd_device *rbd_dev, | |
1118 | struct ceph_snap_context *snapc, | |
1119 | u64 ofs, u64 len, | |
1fec7093 YS |
1120 | struct bio *bio, |
1121 | struct rbd_req_coll *coll, | |
1122 | int coll_index) | |
602adf40 YS |
1123 | { |
1124 | return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP, | |
1125 | CEPH_OSD_OP_WRITE, | |
1126 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1127 | 2, | |
1fec7093 | 1128 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1129 | } |
1130 | ||
1131 | /* | |
1132 | * Request async osd read | |
1133 | */ | |
1134 | static int rbd_req_read(struct request *rq, | |
1135 | struct rbd_device *rbd_dev, | |
1136 | u64 snapid, | |
1137 | u64 ofs, u64 len, | |
1fec7093 YS |
1138 | struct bio *bio, |
1139 | struct rbd_req_coll *coll, | |
1140 | int coll_index) | |
602adf40 YS |
1141 | { |
1142 | return rbd_do_op(rq, rbd_dev, NULL, | |
1143 | (snapid ? snapid : CEPH_NOSNAP), | |
1144 | CEPH_OSD_OP_READ, | |
1145 | CEPH_OSD_FLAG_READ, | |
1146 | 2, | |
1fec7093 | 1147 | ofs, len, bio, coll, coll_index); |
602adf40 YS |
1148 | } |
1149 | ||
1150 | /* | |
1151 | * Request sync osd read | |
1152 | */ | |
1153 | static int rbd_req_sync_read(struct rbd_device *dev, | |
1154 | struct ceph_snap_context *snapc, | |
1155 | u64 snapid, | |
1156 | const char *obj, | |
1157 | u64 ofs, u64 len, | |
59c2be1e YS |
1158 | char *buf, |
1159 | u64 *ver) | |
602adf40 YS |
1160 | { |
1161 | return rbd_req_sync_op(dev, NULL, | |
1162 | (snapid ? snapid : CEPH_NOSNAP), | |
1163 | CEPH_OSD_OP_READ, | |
1164 | CEPH_OSD_FLAG_READ, | |
1165 | NULL, | |
59c2be1e | 1166 | 1, obj, ofs, len, buf, NULL, ver); |
602adf40 YS |
1167 | } |
1168 | ||
1169 | /* | |
59c2be1e YS |
1170 | * Request sync osd watch |
1171 | */ | |
1172 | static int rbd_req_sync_notify_ack(struct rbd_device *dev, | |
1173 | u64 ver, | |
1174 | u64 notify_id, | |
1175 | const char *obj) | |
1176 | { | |
1177 | struct ceph_osd_req_op *ops; | |
1178 | struct page **pages = NULL; | |
11f77002 SW |
1179 | int ret; |
1180 | ||
1181 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY_ACK, 0); | |
59c2be1e YS |
1182 | if (ret < 0) |
1183 | return ret; | |
1184 | ||
1185 | ops[0].watch.ver = cpu_to_le64(dev->header.obj_version); | |
1186 | ops[0].watch.cookie = notify_id; | |
1187 | ops[0].watch.flag = 0; | |
1188 | ||
1189 | ret = rbd_do_request(NULL, dev, NULL, CEPH_NOSNAP, | |
1190 | obj, 0, 0, NULL, | |
1191 | pages, 0, | |
1192 | CEPH_OSD_FLAG_READ, | |
1193 | ops, | |
1194 | 1, | |
1fec7093 | 1195 | NULL, 0, |
59c2be1e YS |
1196 | rbd_simple_req_cb, 0, NULL); |
1197 | ||
1198 | rbd_destroy_ops(ops); | |
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1203 | { | |
1204 | struct rbd_device *dev = (struct rbd_device *)data; | |
13143d2d SW |
1205 | int rc; |
1206 | ||
59c2be1e YS |
1207 | if (!dev) |
1208 | return; | |
1209 | ||
1210 | dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, | |
1211 | notify_id, (int)opcode); | |
1212 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
13143d2d | 1213 | rc = __rbd_update_snaps(dev); |
59c2be1e | 1214 | mutex_unlock(&ctl_mutex); |
13143d2d SW |
1215 | if (rc) |
1216 | pr_warning(DRV_NAME "%d got notification but failed to update" | |
1217 | " snaps: %d\n", dev->major, rc); | |
59c2be1e YS |
1218 | |
1219 | rbd_req_sync_notify_ack(dev, ver, notify_id, dev->obj_md_name); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Request sync osd watch | |
1224 | */ | |
1225 | static int rbd_req_sync_watch(struct rbd_device *dev, | |
1226 | const char *obj, | |
1227 | u64 ver) | |
1228 | { | |
1229 | struct ceph_osd_req_op *ops; | |
1230 | struct ceph_osd_client *osdc = &dev->client->osdc; | |
1231 | ||
1232 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1233 | if (ret < 0) | |
1234 | return ret; | |
1235 | ||
1236 | ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, | |
1237 | (void *)dev, &dev->watch_event); | |
1238 | if (ret < 0) | |
1239 | goto fail; | |
1240 | ||
1241 | ops[0].watch.ver = cpu_to_le64(ver); | |
1242 | ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie); | |
1243 | ops[0].watch.flag = 1; | |
1244 | ||
1245 | ret = rbd_req_sync_op(dev, NULL, | |
1246 | CEPH_NOSNAP, | |
1247 | 0, | |
1248 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1249 | ops, | |
1250 | 1, obj, 0, 0, NULL, | |
1251 | &dev->watch_request, NULL); | |
1252 | ||
1253 | if (ret < 0) | |
1254 | goto fail_event; | |
1255 | ||
1256 | rbd_destroy_ops(ops); | |
1257 | return 0; | |
1258 | ||
1259 | fail_event: | |
1260 | ceph_osdc_cancel_event(dev->watch_event); | |
1261 | dev->watch_event = NULL; | |
1262 | fail: | |
1263 | rbd_destroy_ops(ops); | |
1264 | return ret; | |
1265 | } | |
1266 | ||
79e3057c YS |
1267 | /* |
1268 | * Request sync osd unwatch | |
1269 | */ | |
1270 | static int rbd_req_sync_unwatch(struct rbd_device *dev, | |
1271 | const char *obj) | |
1272 | { | |
1273 | struct ceph_osd_req_op *ops; | |
1274 | ||
1275 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_WATCH, 0); | |
1276 | if (ret < 0) | |
1277 | return ret; | |
1278 | ||
1279 | ops[0].watch.ver = 0; | |
1280 | ops[0].watch.cookie = cpu_to_le64(dev->watch_event->cookie); | |
1281 | ops[0].watch.flag = 0; | |
1282 | ||
1283 | ret = rbd_req_sync_op(dev, NULL, | |
1284 | CEPH_NOSNAP, | |
1285 | 0, | |
1286 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1287 | ops, | |
1288 | 1, obj, 0, 0, NULL, NULL, NULL); | |
1289 | ||
1290 | rbd_destroy_ops(ops); | |
1291 | ceph_osdc_cancel_event(dev->watch_event); | |
1292 | dev->watch_event = NULL; | |
1293 | return ret; | |
1294 | } | |
1295 | ||
59c2be1e YS |
1296 | struct rbd_notify_info { |
1297 | struct rbd_device *dev; | |
1298 | }; | |
1299 | ||
1300 | static void rbd_notify_cb(u64 ver, u64 notify_id, u8 opcode, void *data) | |
1301 | { | |
1302 | struct rbd_device *dev = (struct rbd_device *)data; | |
1303 | if (!dev) | |
1304 | return; | |
1305 | ||
1306 | dout("rbd_notify_cb %s notify_id=%lld opcode=%d\n", dev->obj_md_name, | |
1307 | notify_id, (int)opcode); | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * Request sync osd notify | |
1312 | */ | |
1313 | static int rbd_req_sync_notify(struct rbd_device *dev, | |
1314 | const char *obj) | |
1315 | { | |
1316 | struct ceph_osd_req_op *ops; | |
1317 | struct ceph_osd_client *osdc = &dev->client->osdc; | |
1318 | struct ceph_osd_event *event; | |
1319 | struct rbd_notify_info info; | |
1320 | int payload_len = sizeof(u32) + sizeof(u32); | |
1321 | int ret; | |
1322 | ||
1323 | ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_NOTIFY, payload_len); | |
1324 | if (ret < 0) | |
1325 | return ret; | |
1326 | ||
1327 | info.dev = dev; | |
1328 | ||
1329 | ret = ceph_osdc_create_event(osdc, rbd_notify_cb, 1, | |
1330 | (void *)&info, &event); | |
1331 | if (ret < 0) | |
1332 | goto fail; | |
1333 | ||
1334 | ops[0].watch.ver = 1; | |
1335 | ops[0].watch.flag = 1; | |
1336 | ops[0].watch.cookie = event->cookie; | |
1337 | ops[0].watch.prot_ver = RADOS_NOTIFY_VER; | |
1338 | ops[0].watch.timeout = 12; | |
1339 | ||
1340 | ret = rbd_req_sync_op(dev, NULL, | |
1341 | CEPH_NOSNAP, | |
1342 | 0, | |
1343 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1344 | ops, | |
1345 | 1, obj, 0, 0, NULL, NULL, NULL); | |
1346 | if (ret < 0) | |
1347 | goto fail_event; | |
1348 | ||
1349 | ret = ceph_osdc_wait_event(event, CEPH_OSD_TIMEOUT_DEFAULT); | |
1350 | dout("ceph_osdc_wait_event returned %d\n", ret); | |
1351 | rbd_destroy_ops(ops); | |
1352 | return 0; | |
1353 | ||
1354 | fail_event: | |
1355 | ceph_osdc_cancel_event(event); | |
1356 | fail: | |
1357 | rbd_destroy_ops(ops); | |
1358 | return ret; | |
1359 | } | |
1360 | ||
602adf40 YS |
1361 | /* |
1362 | * Request sync osd read | |
1363 | */ | |
1364 | static int rbd_req_sync_exec(struct rbd_device *dev, | |
1365 | const char *obj, | |
1366 | const char *cls, | |
1367 | const char *method, | |
1368 | const char *data, | |
59c2be1e YS |
1369 | int len, |
1370 | u64 *ver) | |
602adf40 YS |
1371 | { |
1372 | struct ceph_osd_req_op *ops; | |
1373 | int cls_len = strlen(cls); | |
1374 | int method_len = strlen(method); | |
1375 | int ret = rbd_create_rw_ops(&ops, 1, CEPH_OSD_OP_CALL, | |
1376 | cls_len + method_len + len); | |
1377 | if (ret < 0) | |
1378 | return ret; | |
1379 | ||
1380 | ops[0].cls.class_name = cls; | |
1381 | ops[0].cls.class_len = (__u8)cls_len; | |
1382 | ops[0].cls.method_name = method; | |
1383 | ops[0].cls.method_len = (__u8)method_len; | |
1384 | ops[0].cls.argc = 0; | |
1385 | ops[0].cls.indata = data; | |
1386 | ops[0].cls.indata_len = len; | |
1387 | ||
1388 | ret = rbd_req_sync_op(dev, NULL, | |
1389 | CEPH_NOSNAP, | |
1390 | 0, | |
1391 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
1392 | ops, | |
59c2be1e | 1393 | 1, obj, 0, 0, NULL, NULL, ver); |
602adf40 YS |
1394 | |
1395 | rbd_destroy_ops(ops); | |
1396 | ||
1397 | dout("cls_exec returned %d\n", ret); | |
1398 | return ret; | |
1399 | } | |
1400 | ||
1fec7093 YS |
1401 | static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) |
1402 | { | |
1403 | struct rbd_req_coll *coll = | |
1404 | kzalloc(sizeof(struct rbd_req_coll) + | |
1405 | sizeof(struct rbd_req_status) * num_reqs, | |
1406 | GFP_ATOMIC); | |
1407 | ||
1408 | if (!coll) | |
1409 | return NULL; | |
1410 | coll->total = num_reqs; | |
1411 | kref_init(&coll->kref); | |
1412 | return coll; | |
1413 | } | |
1414 | ||
602adf40 YS |
1415 | /* |
1416 | * block device queue callback | |
1417 | */ | |
1418 | static void rbd_rq_fn(struct request_queue *q) | |
1419 | { | |
1420 | struct rbd_device *rbd_dev = q->queuedata; | |
1421 | struct request *rq; | |
1422 | struct bio_pair *bp = NULL; | |
1423 | ||
1424 | rq = blk_fetch_request(q); | |
1425 | ||
1426 | while (1) { | |
1427 | struct bio *bio; | |
1428 | struct bio *rq_bio, *next_bio = NULL; | |
1429 | bool do_write; | |
1430 | int size, op_size = 0; | |
1431 | u64 ofs; | |
1fec7093 YS |
1432 | int num_segs, cur_seg = 0; |
1433 | struct rbd_req_coll *coll; | |
602adf40 YS |
1434 | |
1435 | /* peek at request from block layer */ | |
1436 | if (!rq) | |
1437 | break; | |
1438 | ||
1439 | dout("fetched request\n"); | |
1440 | ||
1441 | /* filter out block requests we don't understand */ | |
1442 | if ((rq->cmd_type != REQ_TYPE_FS)) { | |
1443 | __blk_end_request_all(rq, 0); | |
1444 | goto next; | |
1445 | } | |
1446 | ||
1447 | /* deduce our operation (read, write) */ | |
1448 | do_write = (rq_data_dir(rq) == WRITE); | |
1449 | ||
1450 | size = blk_rq_bytes(rq); | |
1451 | ofs = blk_rq_pos(rq) * 512ULL; | |
1452 | rq_bio = rq->bio; | |
1453 | if (do_write && rbd_dev->read_only) { | |
1454 | __blk_end_request_all(rq, -EROFS); | |
1455 | goto next; | |
1456 | } | |
1457 | ||
1458 | spin_unlock_irq(q->queue_lock); | |
1459 | ||
1460 | dout("%s 0x%x bytes at 0x%llx\n", | |
1461 | do_write ? "write" : "read", | |
1462 | size, blk_rq_pos(rq) * 512ULL); | |
1463 | ||
1fec7093 YS |
1464 | num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); |
1465 | coll = rbd_alloc_coll(num_segs); | |
1466 | if (!coll) { | |
1467 | spin_lock_irq(q->queue_lock); | |
1468 | __blk_end_request_all(rq, -ENOMEM); | |
1469 | goto next; | |
1470 | } | |
1471 | ||
602adf40 YS |
1472 | do { |
1473 | /* a bio clone to be passed down to OSD req */ | |
1474 | dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt); | |
1475 | op_size = rbd_get_segment(&rbd_dev->header, | |
1476 | rbd_dev->header.block_name, | |
1477 | ofs, size, | |
1478 | NULL, NULL); | |
1fec7093 | 1479 | kref_get(&coll->kref); |
602adf40 YS |
1480 | bio = bio_chain_clone(&rq_bio, &next_bio, &bp, |
1481 | op_size, GFP_ATOMIC); | |
1482 | if (!bio) { | |
1fec7093 YS |
1483 | rbd_coll_end_req_index(rq, coll, cur_seg, |
1484 | -ENOMEM, op_size); | |
1485 | goto next_seg; | |
602adf40 YS |
1486 | } |
1487 | ||
1fec7093 | 1488 | |
602adf40 YS |
1489 | /* init OSD command: write or read */ |
1490 | if (do_write) | |
1491 | rbd_req_write(rq, rbd_dev, | |
1492 | rbd_dev->header.snapc, | |
1493 | ofs, | |
1fec7093 YS |
1494 | op_size, bio, |
1495 | coll, cur_seg); | |
602adf40 YS |
1496 | else |
1497 | rbd_req_read(rq, rbd_dev, | |
1498 | cur_snap_id(rbd_dev), | |
1499 | ofs, | |
1fec7093 YS |
1500 | op_size, bio, |
1501 | coll, cur_seg); | |
602adf40 | 1502 | |
1fec7093 | 1503 | next_seg: |
602adf40 YS |
1504 | size -= op_size; |
1505 | ofs += op_size; | |
1506 | ||
1fec7093 | 1507 | cur_seg++; |
602adf40 YS |
1508 | rq_bio = next_bio; |
1509 | } while (size > 0); | |
1fec7093 | 1510 | kref_put(&coll->kref, rbd_coll_release); |
602adf40 YS |
1511 | |
1512 | if (bp) | |
1513 | bio_pair_release(bp); | |
602adf40 YS |
1514 | spin_lock_irq(q->queue_lock); |
1515 | next: | |
1516 | rq = blk_fetch_request(q); | |
1517 | } | |
1518 | } | |
1519 | ||
1520 | /* | |
1521 | * a queue callback. Makes sure that we don't create a bio that spans across | |
1522 | * multiple osd objects. One exception would be with a single page bios, | |
1523 | * which we handle later at bio_chain_clone | |
1524 | */ | |
1525 | static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, | |
1526 | struct bio_vec *bvec) | |
1527 | { | |
1528 | struct rbd_device *rbd_dev = q->queuedata; | |
1529 | unsigned int chunk_sectors = 1 << (rbd_dev->header.obj_order - 9); | |
1530 | sector_t sector = bmd->bi_sector + get_start_sect(bmd->bi_bdev); | |
1531 | unsigned int bio_sectors = bmd->bi_size >> 9; | |
1532 | int max; | |
1533 | ||
1534 | max = (chunk_sectors - ((sector & (chunk_sectors - 1)) | |
1535 | + bio_sectors)) << 9; | |
1536 | if (max < 0) | |
1537 | max = 0; /* bio_add cannot handle a negative return */ | |
1538 | if (max <= bvec->bv_len && bio_sectors == 0) | |
1539 | return bvec->bv_len; | |
1540 | return max; | |
1541 | } | |
1542 | ||
1543 | static void rbd_free_disk(struct rbd_device *rbd_dev) | |
1544 | { | |
1545 | struct gendisk *disk = rbd_dev->disk; | |
1546 | ||
1547 | if (!disk) | |
1548 | return; | |
1549 | ||
1550 | rbd_header_free(&rbd_dev->header); | |
1551 | ||
1552 | if (disk->flags & GENHD_FL_UP) | |
1553 | del_gendisk(disk); | |
1554 | if (disk->queue) | |
1555 | blk_cleanup_queue(disk->queue); | |
1556 | put_disk(disk); | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * reload the ondisk the header | |
1561 | */ | |
1562 | static int rbd_read_header(struct rbd_device *rbd_dev, | |
1563 | struct rbd_image_header *header) | |
1564 | { | |
1565 | ssize_t rc; | |
1566 | struct rbd_image_header_ondisk *dh; | |
1567 | int snap_count = 0; | |
1568 | u64 snap_names_len = 0; | |
59c2be1e | 1569 | u64 ver; |
602adf40 YS |
1570 | |
1571 | while (1) { | |
1572 | int len = sizeof(*dh) + | |
1573 | snap_count * sizeof(struct rbd_image_snap_ondisk) + | |
1574 | snap_names_len; | |
1575 | ||
1576 | rc = -ENOMEM; | |
1577 | dh = kmalloc(len, GFP_KERNEL); | |
1578 | if (!dh) | |
1579 | return -ENOMEM; | |
1580 | ||
1581 | rc = rbd_req_sync_read(rbd_dev, | |
1582 | NULL, CEPH_NOSNAP, | |
1583 | rbd_dev->obj_md_name, | |
1584 | 0, len, | |
59c2be1e | 1585 | (char *)dh, &ver); |
602adf40 YS |
1586 | if (rc < 0) |
1587 | goto out_dh; | |
1588 | ||
1589 | rc = rbd_header_from_disk(header, dh, snap_count, GFP_KERNEL); | |
81e759fb JD |
1590 | if (rc < 0) { |
1591 | if (rc == -ENXIO) { | |
1592 | pr_warning("unrecognized header format" | |
1593 | " for image %s", rbd_dev->obj); | |
1594 | } | |
602adf40 | 1595 | goto out_dh; |
81e759fb | 1596 | } |
602adf40 YS |
1597 | |
1598 | if (snap_count != header->total_snaps) { | |
1599 | snap_count = header->total_snaps; | |
1600 | snap_names_len = header->snap_names_len; | |
1601 | rbd_header_free(header); | |
1602 | kfree(dh); | |
1603 | continue; | |
1604 | } | |
1605 | break; | |
1606 | } | |
59c2be1e | 1607 | header->obj_version = ver; |
602adf40 YS |
1608 | |
1609 | out_dh: | |
1610 | kfree(dh); | |
1611 | return rc; | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * create a snapshot | |
1616 | */ | |
1617 | static int rbd_header_add_snap(struct rbd_device *dev, | |
1618 | const char *snap_name, | |
1619 | gfp_t gfp_flags) | |
1620 | { | |
1621 | int name_len = strlen(snap_name); | |
1622 | u64 new_snapid; | |
1623 | int ret; | |
916d4d67 | 1624 | void *data, *p, *e; |
59c2be1e | 1625 | u64 ver; |
602adf40 YS |
1626 | |
1627 | /* we should create a snapshot only if we're pointing at the head */ | |
1628 | if (dev->cur_snap) | |
1629 | return -EINVAL; | |
1630 | ||
1631 | ret = ceph_monc_create_snapid(&dev->client->monc, dev->poolid, | |
1632 | &new_snapid); | |
1633 | dout("created snapid=%lld\n", new_snapid); | |
1634 | if (ret < 0) | |
1635 | return ret; | |
1636 | ||
1637 | data = kmalloc(name_len + 16, gfp_flags); | |
1638 | if (!data) | |
1639 | return -ENOMEM; | |
1640 | ||
916d4d67 SW |
1641 | p = data; |
1642 | e = data + name_len + 16; | |
602adf40 | 1643 | |
916d4d67 SW |
1644 | ceph_encode_string_safe(&p, e, snap_name, name_len, bad); |
1645 | ceph_encode_64_safe(&p, e, new_snapid, bad); | |
602adf40 YS |
1646 | |
1647 | ret = rbd_req_sync_exec(dev, dev->obj_md_name, "rbd", "snap_add", | |
916d4d67 | 1648 | data, p - data, &ver); |
602adf40 | 1649 | |
916d4d67 | 1650 | kfree(data); |
602adf40 YS |
1651 | |
1652 | if (ret < 0) | |
1653 | return ret; | |
1654 | ||
1655 | dev->header.snapc->seq = new_snapid; | |
1656 | ||
1657 | return 0; | |
1658 | bad: | |
1659 | return -ERANGE; | |
1660 | } | |
1661 | ||
dfc5606d YS |
1662 | static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
1663 | { | |
1664 | struct rbd_snap *snap; | |
1665 | ||
1666 | while (!list_empty(&rbd_dev->snaps)) { | |
1667 | snap = list_first_entry(&rbd_dev->snaps, struct rbd_snap, node); | |
1668 | __rbd_remove_snap_dev(rbd_dev, snap); | |
1669 | } | |
1670 | } | |
1671 | ||
602adf40 YS |
1672 | /* |
1673 | * only read the first part of the ondisk header, without the snaps info | |
1674 | */ | |
dfc5606d | 1675 | static int __rbd_update_snaps(struct rbd_device *rbd_dev) |
602adf40 YS |
1676 | { |
1677 | int ret; | |
1678 | struct rbd_image_header h; | |
1679 | u64 snap_seq; | |
59c2be1e | 1680 | int follow_seq = 0; |
602adf40 YS |
1681 | |
1682 | ret = rbd_read_header(rbd_dev, &h); | |
1683 | if (ret < 0) | |
1684 | return ret; | |
1685 | ||
9db4b3e3 SW |
1686 | /* resized? */ |
1687 | set_capacity(rbd_dev->disk, h.image_size / 512ULL); | |
1688 | ||
602adf40 YS |
1689 | down_write(&rbd_dev->header.snap_rwsem); |
1690 | ||
1691 | snap_seq = rbd_dev->header.snapc->seq; | |
59c2be1e YS |
1692 | if (rbd_dev->header.total_snaps && |
1693 | rbd_dev->header.snapc->snaps[0] == snap_seq) | |
1694 | /* pointing at the head, will need to follow that | |
1695 | if head moves */ | |
1696 | follow_seq = 1; | |
602adf40 YS |
1697 | |
1698 | kfree(rbd_dev->header.snapc); | |
1699 | kfree(rbd_dev->header.snap_names); | |
1700 | kfree(rbd_dev->header.snap_sizes); | |
1701 | ||
1702 | rbd_dev->header.total_snaps = h.total_snaps; | |
1703 | rbd_dev->header.snapc = h.snapc; | |
1704 | rbd_dev->header.snap_names = h.snap_names; | |
dfc5606d | 1705 | rbd_dev->header.snap_names_len = h.snap_names_len; |
602adf40 | 1706 | rbd_dev->header.snap_sizes = h.snap_sizes; |
59c2be1e YS |
1707 | if (follow_seq) |
1708 | rbd_dev->header.snapc->seq = rbd_dev->header.snapc->snaps[0]; | |
1709 | else | |
1710 | rbd_dev->header.snapc->seq = snap_seq; | |
602adf40 | 1711 | |
dfc5606d YS |
1712 | ret = __rbd_init_snaps_header(rbd_dev); |
1713 | ||
602adf40 YS |
1714 | up_write(&rbd_dev->header.snap_rwsem); |
1715 | ||
dfc5606d | 1716 | return ret; |
602adf40 YS |
1717 | } |
1718 | ||
1719 | static int rbd_init_disk(struct rbd_device *rbd_dev) | |
1720 | { | |
1721 | struct gendisk *disk; | |
1722 | struct request_queue *q; | |
1723 | int rc; | |
1724 | u64 total_size = 0; | |
1725 | ||
1726 | /* contact OSD, request size info about the object being mapped */ | |
1727 | rc = rbd_read_header(rbd_dev, &rbd_dev->header); | |
1728 | if (rc) | |
1729 | return rc; | |
1730 | ||
dfc5606d YS |
1731 | /* no need to lock here, as rbd_dev is not registered yet */ |
1732 | rc = __rbd_init_snaps_header(rbd_dev); | |
1733 | if (rc) | |
1734 | return rc; | |
1735 | ||
602adf40 YS |
1736 | rc = rbd_header_set_snap(rbd_dev, rbd_dev->snap_name, &total_size); |
1737 | if (rc) | |
1738 | return rc; | |
1739 | ||
1740 | /* create gendisk info */ | |
1741 | rc = -ENOMEM; | |
1742 | disk = alloc_disk(RBD_MINORS_PER_MAJOR); | |
1743 | if (!disk) | |
1744 | goto out; | |
1745 | ||
aedfec59 SW |
1746 | snprintf(disk->disk_name, sizeof(disk->disk_name), DRV_NAME "%d", |
1747 | rbd_dev->id); | |
602adf40 YS |
1748 | disk->major = rbd_dev->major; |
1749 | disk->first_minor = 0; | |
1750 | disk->fops = &rbd_bd_ops; | |
1751 | disk->private_data = rbd_dev; | |
1752 | ||
1753 | /* init rq */ | |
1754 | rc = -ENOMEM; | |
1755 | q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); | |
1756 | if (!q) | |
1757 | goto out_disk; | |
029bcbd8 JD |
1758 | |
1759 | /* set io sizes to object size */ | |
1760 | blk_queue_max_hw_sectors(q, rbd_obj_bytes(&rbd_dev->header) / 512ULL); | |
1761 | blk_queue_max_segment_size(q, rbd_obj_bytes(&rbd_dev->header)); | |
1762 | blk_queue_io_min(q, rbd_obj_bytes(&rbd_dev->header)); | |
1763 | blk_queue_io_opt(q, rbd_obj_bytes(&rbd_dev->header)); | |
1764 | ||
602adf40 YS |
1765 | blk_queue_merge_bvec(q, rbd_merge_bvec); |
1766 | disk->queue = q; | |
1767 | ||
1768 | q->queuedata = rbd_dev; | |
1769 | ||
1770 | rbd_dev->disk = disk; | |
1771 | rbd_dev->q = q; | |
1772 | ||
1773 | /* finally, announce the disk to the world */ | |
1774 | set_capacity(disk, total_size / 512ULL); | |
1775 | add_disk(disk); | |
1776 | ||
1777 | pr_info("%s: added with size 0x%llx\n", | |
1778 | disk->disk_name, (unsigned long long)total_size); | |
1779 | return 0; | |
1780 | ||
1781 | out_disk: | |
1782 | put_disk(disk); | |
1783 | out: | |
1784 | return rc; | |
1785 | } | |
1786 | ||
dfc5606d YS |
1787 | /* |
1788 | sysfs | |
1789 | */ | |
1790 | ||
1791 | static ssize_t rbd_size_show(struct device *dev, | |
1792 | struct device_attribute *attr, char *buf) | |
1793 | { | |
1794 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1795 | ||
1796 | return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); | |
1797 | } | |
1798 | ||
1799 | static ssize_t rbd_major_show(struct device *dev, | |
1800 | struct device_attribute *attr, char *buf) | |
1801 | { | |
1802 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
602adf40 | 1803 | |
dfc5606d YS |
1804 | return sprintf(buf, "%d\n", rbd_dev->major); |
1805 | } | |
1806 | ||
1807 | static ssize_t rbd_client_id_show(struct device *dev, | |
1808 | struct device_attribute *attr, char *buf) | |
602adf40 | 1809 | { |
dfc5606d YS |
1810 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1811 | ||
1812 | return sprintf(buf, "client%lld\n", ceph_client_id(rbd_dev->client)); | |
602adf40 YS |
1813 | } |
1814 | ||
dfc5606d YS |
1815 | static ssize_t rbd_pool_show(struct device *dev, |
1816 | struct device_attribute *attr, char *buf) | |
602adf40 | 1817 | { |
dfc5606d YS |
1818 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
1819 | ||
1820 | return sprintf(buf, "%s\n", rbd_dev->pool_name); | |
1821 | } | |
1822 | ||
1823 | static ssize_t rbd_name_show(struct device *dev, | |
1824 | struct device_attribute *attr, char *buf) | |
1825 | { | |
1826 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1827 | ||
1828 | return sprintf(buf, "%s\n", rbd_dev->obj); | |
1829 | } | |
1830 | ||
1831 | static ssize_t rbd_snap_show(struct device *dev, | |
1832 | struct device_attribute *attr, | |
1833 | char *buf) | |
1834 | { | |
1835 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1836 | ||
1837 | return sprintf(buf, "%s\n", rbd_dev->snap_name); | |
1838 | } | |
1839 | ||
1840 | static ssize_t rbd_image_refresh(struct device *dev, | |
1841 | struct device_attribute *attr, | |
1842 | const char *buf, | |
1843 | size_t size) | |
1844 | { | |
1845 | struct rbd_device *rbd_dev = dev_to_rbd(dev); | |
1846 | int rc; | |
1847 | int ret = size; | |
602adf40 YS |
1848 | |
1849 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1850 | ||
dfc5606d YS |
1851 | rc = __rbd_update_snaps(rbd_dev); |
1852 | if (rc < 0) | |
1853 | ret = rc; | |
602adf40 | 1854 | |
dfc5606d YS |
1855 | mutex_unlock(&ctl_mutex); |
1856 | return ret; | |
1857 | } | |
602adf40 | 1858 | |
dfc5606d YS |
1859 | static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
1860 | static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); | |
1861 | static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); | |
1862 | static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); | |
1863 | static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); | |
1864 | static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); | |
1865 | static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); | |
1866 | static DEVICE_ATTR(create_snap, S_IWUSR, NULL, rbd_snap_add); | |
dfc5606d YS |
1867 | |
1868 | static struct attribute *rbd_attrs[] = { | |
1869 | &dev_attr_size.attr, | |
1870 | &dev_attr_major.attr, | |
1871 | &dev_attr_client_id.attr, | |
1872 | &dev_attr_pool.attr, | |
1873 | &dev_attr_name.attr, | |
1874 | &dev_attr_current_snap.attr, | |
1875 | &dev_attr_refresh.attr, | |
1876 | &dev_attr_create_snap.attr, | |
dfc5606d YS |
1877 | NULL |
1878 | }; | |
1879 | ||
1880 | static struct attribute_group rbd_attr_group = { | |
1881 | .attrs = rbd_attrs, | |
1882 | }; | |
1883 | ||
1884 | static const struct attribute_group *rbd_attr_groups[] = { | |
1885 | &rbd_attr_group, | |
1886 | NULL | |
1887 | }; | |
1888 | ||
1889 | static void rbd_sysfs_dev_release(struct device *dev) | |
1890 | { | |
1891 | } | |
1892 | ||
1893 | static struct device_type rbd_device_type = { | |
1894 | .name = "rbd", | |
1895 | .groups = rbd_attr_groups, | |
1896 | .release = rbd_sysfs_dev_release, | |
1897 | }; | |
1898 | ||
1899 | ||
1900 | /* | |
1901 | sysfs - snapshots | |
1902 | */ | |
1903 | ||
1904 | static ssize_t rbd_snap_size_show(struct device *dev, | |
1905 | struct device_attribute *attr, | |
1906 | char *buf) | |
1907 | { | |
1908 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1909 | ||
1910 | return sprintf(buf, "%lld\n", (long long)snap->size); | |
1911 | } | |
1912 | ||
1913 | static ssize_t rbd_snap_id_show(struct device *dev, | |
1914 | struct device_attribute *attr, | |
1915 | char *buf) | |
1916 | { | |
1917 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1918 | ||
1919 | return sprintf(buf, "%lld\n", (long long)snap->id); | |
1920 | } | |
1921 | ||
1922 | static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); | |
1923 | static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); | |
1924 | ||
1925 | static struct attribute *rbd_snap_attrs[] = { | |
1926 | &dev_attr_snap_size.attr, | |
1927 | &dev_attr_snap_id.attr, | |
1928 | NULL, | |
1929 | }; | |
1930 | ||
1931 | static struct attribute_group rbd_snap_attr_group = { | |
1932 | .attrs = rbd_snap_attrs, | |
1933 | }; | |
1934 | ||
1935 | static void rbd_snap_dev_release(struct device *dev) | |
1936 | { | |
1937 | struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); | |
1938 | kfree(snap->name); | |
1939 | kfree(snap); | |
1940 | } | |
1941 | ||
1942 | static const struct attribute_group *rbd_snap_attr_groups[] = { | |
1943 | &rbd_snap_attr_group, | |
1944 | NULL | |
1945 | }; | |
1946 | ||
1947 | static struct device_type rbd_snap_device_type = { | |
1948 | .groups = rbd_snap_attr_groups, | |
1949 | .release = rbd_snap_dev_release, | |
1950 | }; | |
1951 | ||
1952 | static void __rbd_remove_snap_dev(struct rbd_device *rbd_dev, | |
1953 | struct rbd_snap *snap) | |
1954 | { | |
1955 | list_del(&snap->node); | |
1956 | device_unregister(&snap->dev); | |
1957 | } | |
1958 | ||
1959 | static int rbd_register_snap_dev(struct rbd_device *rbd_dev, | |
1960 | struct rbd_snap *snap, | |
1961 | struct device *parent) | |
1962 | { | |
1963 | struct device *dev = &snap->dev; | |
1964 | int ret; | |
1965 | ||
1966 | dev->type = &rbd_snap_device_type; | |
1967 | dev->parent = parent; | |
1968 | dev->release = rbd_snap_dev_release; | |
1969 | dev_set_name(dev, "snap_%s", snap->name); | |
1970 | ret = device_register(dev); | |
1971 | ||
1972 | return ret; | |
1973 | } | |
1974 | ||
1975 | static int __rbd_add_snap_dev(struct rbd_device *rbd_dev, | |
1976 | int i, const char *name, | |
1977 | struct rbd_snap **snapp) | |
1978 | { | |
1979 | int ret; | |
1980 | struct rbd_snap *snap = kzalloc(sizeof(*snap), GFP_KERNEL); | |
1981 | if (!snap) | |
1982 | return -ENOMEM; | |
1983 | snap->name = kstrdup(name, GFP_KERNEL); | |
1984 | snap->size = rbd_dev->header.snap_sizes[i]; | |
1985 | snap->id = rbd_dev->header.snapc->snaps[i]; | |
1986 | if (device_is_registered(&rbd_dev->dev)) { | |
1987 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
1988 | &rbd_dev->dev); | |
1989 | if (ret < 0) | |
1990 | goto err; | |
1991 | } | |
1992 | *snapp = snap; | |
1993 | return 0; | |
1994 | err: | |
1995 | kfree(snap->name); | |
1996 | kfree(snap); | |
1997 | return ret; | |
1998 | } | |
1999 | ||
2000 | /* | |
2001 | * search for the previous snap in a null delimited string list | |
2002 | */ | |
2003 | const char *rbd_prev_snap_name(const char *name, const char *start) | |
2004 | { | |
2005 | if (name < start + 2) | |
2006 | return NULL; | |
2007 | ||
2008 | name -= 2; | |
2009 | while (*name) { | |
2010 | if (name == start) | |
2011 | return start; | |
2012 | name--; | |
2013 | } | |
2014 | return name + 1; | |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | * compare the old list of snapshots that we have to what's in the header | |
2019 | * and update it accordingly. Note that the header holds the snapshots | |
2020 | * in a reverse order (from newest to oldest) and we need to go from | |
2021 | * older to new so that we don't get a duplicate snap name when | |
2022 | * doing the process (e.g., removed snapshot and recreated a new | |
2023 | * one with the same name. | |
2024 | */ | |
2025 | static int __rbd_init_snaps_header(struct rbd_device *rbd_dev) | |
2026 | { | |
2027 | const char *name, *first_name; | |
2028 | int i = rbd_dev->header.total_snaps; | |
2029 | struct rbd_snap *snap, *old_snap = NULL; | |
2030 | int ret; | |
2031 | struct list_head *p, *n; | |
2032 | ||
2033 | first_name = rbd_dev->header.snap_names; | |
2034 | name = first_name + rbd_dev->header.snap_names_len; | |
2035 | ||
2036 | list_for_each_prev_safe(p, n, &rbd_dev->snaps) { | |
2037 | u64 cur_id; | |
2038 | ||
2039 | old_snap = list_entry(p, struct rbd_snap, node); | |
2040 | ||
2041 | if (i) | |
2042 | cur_id = rbd_dev->header.snapc->snaps[i - 1]; | |
2043 | ||
2044 | if (!i || old_snap->id < cur_id) { | |
2045 | /* old_snap->id was skipped, thus was removed */ | |
2046 | __rbd_remove_snap_dev(rbd_dev, old_snap); | |
2047 | continue; | |
2048 | } | |
2049 | if (old_snap->id == cur_id) { | |
2050 | /* we have this snapshot already */ | |
2051 | i--; | |
2052 | name = rbd_prev_snap_name(name, first_name); | |
2053 | continue; | |
2054 | } | |
2055 | for (; i > 0; | |
2056 | i--, name = rbd_prev_snap_name(name, first_name)) { | |
2057 | if (!name) { | |
2058 | WARN_ON(1); | |
2059 | return -EINVAL; | |
2060 | } | |
2061 | cur_id = rbd_dev->header.snapc->snaps[i]; | |
2062 | /* snapshot removal? handle it above */ | |
2063 | if (cur_id >= old_snap->id) | |
2064 | break; | |
2065 | /* a new snapshot */ | |
2066 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2067 | if (ret < 0) | |
2068 | return ret; | |
2069 | ||
2070 | /* note that we add it backward so using n and not p */ | |
2071 | list_add(&snap->node, n); | |
2072 | p = &snap->node; | |
2073 | } | |
2074 | } | |
2075 | /* we're done going over the old snap list, just add what's left */ | |
2076 | for (; i > 0; i--) { | |
2077 | name = rbd_prev_snap_name(name, first_name); | |
2078 | if (!name) { | |
2079 | WARN_ON(1); | |
2080 | return -EINVAL; | |
2081 | } | |
2082 | ret = __rbd_add_snap_dev(rbd_dev, i - 1, name, &snap); | |
2083 | if (ret < 0) | |
2084 | return ret; | |
2085 | list_add(&snap->node, &rbd_dev->snaps); | |
2086 | } | |
2087 | ||
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | ||
2092 | static void rbd_root_dev_release(struct device *dev) | |
2093 | { | |
2094 | } | |
2095 | ||
2096 | static struct device rbd_root_dev = { | |
2097 | .init_name = "rbd", | |
2098 | .release = rbd_root_dev_release, | |
2099 | }; | |
2100 | ||
2101 | static int rbd_bus_add_dev(struct rbd_device *rbd_dev) | |
2102 | { | |
2103 | int ret = -ENOMEM; | |
2104 | struct device *dev; | |
2105 | struct rbd_snap *snap; | |
2106 | ||
2107 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2108 | dev = &rbd_dev->dev; | |
2109 | ||
2110 | dev->bus = &rbd_bus_type; | |
2111 | dev->type = &rbd_device_type; | |
2112 | dev->parent = &rbd_root_dev; | |
2113 | dev->release = rbd_dev_release; | |
2114 | dev_set_name(dev, "%d", rbd_dev->id); | |
2115 | ret = device_register(dev); | |
2116 | if (ret < 0) | |
2117 | goto done_free; | |
2118 | ||
2119 | list_for_each_entry(snap, &rbd_dev->snaps, node) { | |
2120 | ret = rbd_register_snap_dev(rbd_dev, snap, | |
2121 | &rbd_dev->dev); | |
2122 | if (ret < 0) | |
602adf40 YS |
2123 | break; |
2124 | } | |
2125 | ||
2126 | mutex_unlock(&ctl_mutex); | |
dfc5606d YS |
2127 | return 0; |
2128 | done_free: | |
2129 | mutex_unlock(&ctl_mutex); | |
2130 | return ret; | |
602adf40 YS |
2131 | } |
2132 | ||
dfc5606d YS |
2133 | static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
2134 | { | |
2135 | device_unregister(&rbd_dev->dev); | |
2136 | } | |
2137 | ||
59c2be1e YS |
2138 | static int rbd_init_watch_dev(struct rbd_device *rbd_dev) |
2139 | { | |
2140 | int ret, rc; | |
2141 | ||
2142 | do { | |
2143 | ret = rbd_req_sync_watch(rbd_dev, rbd_dev->obj_md_name, | |
2144 | rbd_dev->header.obj_version); | |
2145 | if (ret == -ERANGE) { | |
2146 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2147 | rc = __rbd_update_snaps(rbd_dev); | |
2148 | mutex_unlock(&ctl_mutex); | |
2149 | if (rc < 0) | |
2150 | return rc; | |
2151 | } | |
2152 | } while (ret == -ERANGE); | |
2153 | ||
2154 | return ret; | |
2155 | } | |
2156 | ||
2157 | static ssize_t rbd_add(struct bus_type *bus, | |
2158 | const char *buf, | |
2159 | size_t count) | |
602adf40 YS |
2160 | { |
2161 | struct ceph_osd_client *osdc; | |
2162 | struct rbd_device *rbd_dev; | |
2163 | ssize_t rc = -ENOMEM; | |
2164 | int irc, new_id = 0; | |
2165 | struct list_head *tmp; | |
2166 | char *mon_dev_name; | |
2167 | char *options; | |
2168 | ||
2169 | if (!try_module_get(THIS_MODULE)) | |
2170 | return -ENODEV; | |
2171 | ||
2172 | mon_dev_name = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
2173 | if (!mon_dev_name) | |
2174 | goto err_out_mod; | |
2175 | ||
2176 | options = kmalloc(RBD_MAX_OPT_LEN, GFP_KERNEL); | |
2177 | if (!options) | |
2178 | goto err_mon_dev; | |
2179 | ||
2180 | /* new rbd_device object */ | |
2181 | rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); | |
2182 | if (!rbd_dev) | |
2183 | goto err_out_opt; | |
2184 | ||
2185 | /* static rbd_device initialization */ | |
2186 | spin_lock_init(&rbd_dev->lock); | |
2187 | INIT_LIST_HEAD(&rbd_dev->node); | |
dfc5606d | 2188 | INIT_LIST_HEAD(&rbd_dev->snaps); |
602adf40 | 2189 | |
0e805a1d AE |
2190 | init_rwsem(&rbd_dev->header.snap_rwsem); |
2191 | ||
602adf40 YS |
2192 | /* generate unique id: find highest unique id, add one */ |
2193 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2194 | ||
2195 | list_for_each(tmp, &rbd_dev_list) { | |
2196 | struct rbd_device *rbd_dev; | |
2197 | ||
2198 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2199 | if (rbd_dev->id >= new_id) | |
2200 | new_id = rbd_dev->id + 1; | |
2201 | } | |
2202 | ||
2203 | rbd_dev->id = new_id; | |
2204 | ||
2205 | /* add to global list */ | |
2206 | list_add_tail(&rbd_dev->node, &rbd_dev_list); | |
2207 | ||
2208 | /* parse add command */ | |
2209 | if (sscanf(buf, "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
2210 | "%" __stringify(RBD_MAX_OPT_LEN) "s " | |
2211 | "%" __stringify(RBD_MAX_POOL_NAME_LEN) "s " | |
2212 | "%" __stringify(RBD_MAX_OBJ_NAME_LEN) "s" | |
2213 | "%" __stringify(RBD_MAX_SNAP_NAME_LEN) "s", | |
2214 | mon_dev_name, options, rbd_dev->pool_name, | |
2215 | rbd_dev->obj, rbd_dev->snap_name) < 4) { | |
2216 | rc = -EINVAL; | |
2217 | goto err_out_slot; | |
2218 | } | |
2219 | ||
2220 | if (rbd_dev->snap_name[0] == 0) | |
2221 | rbd_dev->snap_name[0] = '-'; | |
2222 | ||
2223 | rbd_dev->obj_len = strlen(rbd_dev->obj); | |
2224 | snprintf(rbd_dev->obj_md_name, sizeof(rbd_dev->obj_md_name), "%s%s", | |
2225 | rbd_dev->obj, RBD_SUFFIX); | |
2226 | ||
2227 | /* initialize rest of new object */ | |
2228 | snprintf(rbd_dev->name, DEV_NAME_LEN, DRV_NAME "%d", rbd_dev->id); | |
2229 | rc = rbd_get_client(rbd_dev, mon_dev_name, options); | |
2230 | if (rc < 0) | |
2231 | goto err_out_slot; | |
2232 | ||
2233 | mutex_unlock(&ctl_mutex); | |
2234 | ||
2235 | /* pick the pool */ | |
2236 | osdc = &rbd_dev->client->osdc; | |
2237 | rc = ceph_pg_poolid_by_name(osdc->osdmap, rbd_dev->pool_name); | |
2238 | if (rc < 0) | |
2239 | goto err_out_client; | |
2240 | rbd_dev->poolid = rc; | |
2241 | ||
2242 | /* register our block device */ | |
2243 | irc = register_blkdev(0, rbd_dev->name); | |
2244 | if (irc < 0) { | |
2245 | rc = irc; | |
2246 | goto err_out_client; | |
2247 | } | |
2248 | rbd_dev->major = irc; | |
2249 | ||
dfc5606d YS |
2250 | rc = rbd_bus_add_dev(rbd_dev); |
2251 | if (rc) | |
766fc439 YS |
2252 | goto err_out_blkdev; |
2253 | ||
602adf40 YS |
2254 | /* set up and announce blkdev mapping */ |
2255 | rc = rbd_init_disk(rbd_dev); | |
2256 | if (rc) | |
766fc439 | 2257 | goto err_out_bus; |
602adf40 | 2258 | |
59c2be1e YS |
2259 | rc = rbd_init_watch_dev(rbd_dev); |
2260 | if (rc) | |
2261 | goto err_out_bus; | |
2262 | ||
602adf40 YS |
2263 | return count; |
2264 | ||
766fc439 YS |
2265 | err_out_bus: |
2266 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2267 | list_del_init(&rbd_dev->node); | |
2268 | mutex_unlock(&ctl_mutex); | |
2269 | ||
2270 | /* this will also clean up rest of rbd_dev stuff */ | |
2271 | ||
2272 | rbd_bus_del_dev(rbd_dev); | |
2273 | kfree(options); | |
2274 | kfree(mon_dev_name); | |
2275 | return rc; | |
2276 | ||
602adf40 YS |
2277 | err_out_blkdev: |
2278 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2279 | err_out_client: | |
2280 | rbd_put_client(rbd_dev); | |
2281 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2282 | err_out_slot: | |
2283 | list_del_init(&rbd_dev->node); | |
2284 | mutex_unlock(&ctl_mutex); | |
2285 | ||
2286 | kfree(rbd_dev); | |
2287 | err_out_opt: | |
2288 | kfree(options); | |
2289 | err_mon_dev: | |
2290 | kfree(mon_dev_name); | |
2291 | err_out_mod: | |
2292 | dout("Error adding device %s\n", buf); | |
2293 | module_put(THIS_MODULE); | |
2294 | return rc; | |
2295 | } | |
2296 | ||
2297 | static struct rbd_device *__rbd_get_dev(unsigned long id) | |
2298 | { | |
2299 | struct list_head *tmp; | |
2300 | struct rbd_device *rbd_dev; | |
2301 | ||
2302 | list_for_each(tmp, &rbd_dev_list) { | |
2303 | rbd_dev = list_entry(tmp, struct rbd_device, node); | |
2304 | if (rbd_dev->id == id) | |
2305 | return rbd_dev; | |
2306 | } | |
2307 | return NULL; | |
2308 | } | |
2309 | ||
dfc5606d | 2310 | static void rbd_dev_release(struct device *dev) |
602adf40 | 2311 | { |
dfc5606d YS |
2312 | struct rbd_device *rbd_dev = |
2313 | container_of(dev, struct rbd_device, dev); | |
602adf40 | 2314 | |
59c2be1e YS |
2315 | if (rbd_dev->watch_request) |
2316 | ceph_osdc_unregister_linger_request(&rbd_dev->client->osdc, | |
2317 | rbd_dev->watch_request); | |
2318 | if (rbd_dev->watch_event) | |
79e3057c | 2319 | rbd_req_sync_unwatch(rbd_dev, rbd_dev->obj_md_name); |
59c2be1e | 2320 | |
602adf40 YS |
2321 | rbd_put_client(rbd_dev); |
2322 | ||
2323 | /* clean up and free blkdev */ | |
2324 | rbd_free_disk(rbd_dev); | |
2325 | unregister_blkdev(rbd_dev->major, rbd_dev->name); | |
2326 | kfree(rbd_dev); | |
2327 | ||
2328 | /* release module ref */ | |
2329 | module_put(THIS_MODULE); | |
602adf40 YS |
2330 | } |
2331 | ||
dfc5606d YS |
2332 | static ssize_t rbd_remove(struct bus_type *bus, |
2333 | const char *buf, | |
2334 | size_t count) | |
602adf40 YS |
2335 | { |
2336 | struct rbd_device *rbd_dev = NULL; | |
2337 | int target_id, rc; | |
2338 | unsigned long ul; | |
2339 | int ret = count; | |
2340 | ||
2341 | rc = strict_strtoul(buf, 10, &ul); | |
2342 | if (rc) | |
2343 | return rc; | |
2344 | ||
2345 | /* convert to int; abort if we lost anything in the conversion */ | |
2346 | target_id = (int) ul; | |
2347 | if (target_id != ul) | |
2348 | return -EINVAL; | |
2349 | ||
2350 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2351 | ||
2352 | rbd_dev = __rbd_get_dev(target_id); | |
2353 | if (!rbd_dev) { | |
2354 | ret = -ENOENT; | |
2355 | goto done; | |
2356 | } | |
2357 | ||
dfc5606d YS |
2358 | list_del_init(&rbd_dev->node); |
2359 | ||
2360 | __rbd_remove_all_snaps(rbd_dev); | |
2361 | rbd_bus_del_dev(rbd_dev); | |
602adf40 YS |
2362 | |
2363 | done: | |
2364 | mutex_unlock(&ctl_mutex); | |
2365 | return ret; | |
2366 | } | |
2367 | ||
dfc5606d YS |
2368 | static ssize_t rbd_snap_add(struct device *dev, |
2369 | struct device_attribute *attr, | |
2370 | const char *buf, | |
2371 | size_t count) | |
602adf40 | 2372 | { |
dfc5606d YS |
2373 | struct rbd_device *rbd_dev = dev_to_rbd(dev); |
2374 | int ret; | |
2375 | char *name = kmalloc(count + 1, GFP_KERNEL); | |
602adf40 YS |
2376 | if (!name) |
2377 | return -ENOMEM; | |
2378 | ||
dfc5606d | 2379 | snprintf(name, count, "%s", buf); |
602adf40 YS |
2380 | |
2381 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2382 | ||
602adf40 YS |
2383 | ret = rbd_header_add_snap(rbd_dev, |
2384 | name, GFP_KERNEL); | |
2385 | if (ret < 0) | |
59c2be1e | 2386 | goto err_unlock; |
602adf40 | 2387 | |
dfc5606d | 2388 | ret = __rbd_update_snaps(rbd_dev); |
602adf40 | 2389 | if (ret < 0) |
59c2be1e YS |
2390 | goto err_unlock; |
2391 | ||
2392 | /* shouldn't hold ctl_mutex when notifying.. notify might | |
2393 | trigger a watch callback that would need to get that mutex */ | |
2394 | mutex_unlock(&ctl_mutex); | |
2395 | ||
2396 | /* make a best effort, don't error if failed */ | |
2397 | rbd_req_sync_notify(rbd_dev, rbd_dev->obj_md_name); | |
602adf40 YS |
2398 | |
2399 | ret = count; | |
59c2be1e YS |
2400 | kfree(name); |
2401 | return ret; | |
2402 | ||
2403 | err_unlock: | |
602adf40 | 2404 | mutex_unlock(&ctl_mutex); |
602adf40 YS |
2405 | kfree(name); |
2406 | return ret; | |
2407 | } | |
2408 | ||
dfc5606d YS |
2409 | static struct bus_attribute rbd_bus_attrs[] = { |
2410 | __ATTR(add, S_IWUSR, NULL, rbd_add), | |
2411 | __ATTR(remove, S_IWUSR, NULL, rbd_remove), | |
602adf40 YS |
2412 | __ATTR_NULL |
2413 | }; | |
2414 | ||
2415 | /* | |
2416 | * create control files in sysfs | |
dfc5606d | 2417 | * /sys/bus/rbd/... |
602adf40 YS |
2418 | */ |
2419 | static int rbd_sysfs_init(void) | |
2420 | { | |
dfc5606d | 2421 | int ret; |
602adf40 | 2422 | |
dfc5606d | 2423 | rbd_bus_type.bus_attrs = rbd_bus_attrs; |
602adf40 | 2424 | |
dfc5606d YS |
2425 | ret = bus_register(&rbd_bus_type); |
2426 | if (ret < 0) | |
2427 | return ret; | |
602adf40 | 2428 | |
dfc5606d | 2429 | ret = device_register(&rbd_root_dev); |
602adf40 | 2430 | |
602adf40 YS |
2431 | return ret; |
2432 | } | |
2433 | ||
2434 | static void rbd_sysfs_cleanup(void) | |
2435 | { | |
dfc5606d YS |
2436 | device_unregister(&rbd_root_dev); |
2437 | bus_unregister(&rbd_bus_type); | |
602adf40 YS |
2438 | } |
2439 | ||
2440 | int __init rbd_init(void) | |
2441 | { | |
2442 | int rc; | |
2443 | ||
2444 | rc = rbd_sysfs_init(); | |
2445 | if (rc) | |
2446 | return rc; | |
2447 | spin_lock_init(&node_lock); | |
2448 | pr_info("loaded " DRV_NAME_LONG "\n"); | |
2449 | return 0; | |
2450 | } | |
2451 | ||
2452 | void __exit rbd_exit(void) | |
2453 | { | |
2454 | rbd_sysfs_cleanup(); | |
2455 | } | |
2456 | ||
2457 | module_init(rbd_init); | |
2458 | module_exit(rbd_exit); | |
2459 | ||
2460 | MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); | |
2461 | MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); | |
2462 | MODULE_DESCRIPTION("rados block device"); | |
2463 | ||
2464 | /* following authorship retained from original osdblk.c */ | |
2465 | MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); | |
2466 | ||
2467 | MODULE_LICENSE("GPL"); |